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Technical Briefs

Microstructure and Wear Properties of Laser Clad (Ti,Mo)C Multiple Carbide Reinforced Fe-Based Composite Coating

[+] Author and Article Information
Xinhong Wang1

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, Chinaxinhongwang@sdu.edu.cn

Min Zhang

 School of Mechanical Engineering, Jinan 250061, China

Shiyao Qu

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China

1

Corresponding author.

J. Tribol 132(4), 044503 (Sep 23, 2010) (5 pages) doi:10.1115/1.4002068 History: Received October 02, 2009; Revised June 21, 2010; Published September 23, 2010; Online September 23, 2010

(Ti,Mo)C multiple carbide reinforced Fe-based composite coating was produced by laser melting a precursor mixture graphite, ferrotitanium (Fe–Ti), and ferromolybdenum (Fe–Mo) powders. The results showed that flowerlike and cubic type (Ti,Mo)C multiple carbides were formed during laser cladding process. The selective area diffraction pattern analysis indicated that (Ti,Mo)C crystallizes with cubic structure, which indicates that (Ti,Mo)C carbides were multiple carbides with Mo dissolved in the TiC structure. The formation of (Ti,Mo)C particles was achieved via a nucleation-growth mechanism during the laser cladding process. Increasing the amount of Fe–Mo in the reactants led to a decrease of carbide size and an increase of volume fraction of carbides. The coating possessed good cracking resistance when the amount of Fe–Mo was controlled within a range of 15 wt %. The Fe-based surface coating reinforced by (Ti,Mo)C multiple carbides gave an excellent wear resistance.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 3

Morphology of the laser clad coating (a) macrograph of longitudinal directions, (b) macrograph of transverse cross section, and (c) local magnification of Fig. 1

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Figure 4

EPMA backscattered electron images and elemental line distribution of the coating with 5 wt % Fe–Mo (a) backscattered electron image and (b) element distribution

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Figure 5

Typical SEM morphology of the coatings (a) 5 wt % Fe–Mo, (b) 10 wt % Fe–Mo, (c) 15 wt % Fe–Mo, and (d) crack of the coating with 17 wt % Fe–Mo

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Figure 6

TEM morphology of (Ti,Mo)C (a) (Ti,Mo)C carbide and (b) electron diffraction pattern

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Figure 8

Wear mass loss via Fe–Mo content

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Figure 7

Effect of Mo on the hardness of the coating

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Figure 2

XRD pattern of the composite coating with 5 wt % Fe–Mo

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Figure 1

A schematic diagram of friction and wear tester

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